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730 Diesel battery Wiring

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Deere Heaven A

12-16-2003 12:05:25

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I have a 730 diesel with electric start. It has two 12 volt batteries correct me if I am wrong but there should be a cable connecting 1 positive post to 1 neg. with a wire connecting to the frame? Does it matter witch side - or positive? When I do this the lights get dim and sparks occur.What would cause this? Thanks, Brian

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John T

12-16-2003 19:09:41

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Re: 730 Diesel battery Wiring in reply to Deere Heaven Austin, Tx, 12-16-2003 12:05:25

Brian, to answer your question YES there "should be a cable connecting one pos post to 1 negative, with a wire connecting to the frame"

CAUTION HOWEVER, the particular pos and neg posts connected together thats also connected to the frame does make a difference!!!!! !!!! Its the center tie junction point where the 2 batteries are connected together (those + and -) THAT GETS CONNECTED TO FRAME,,,,, ,,,NOT THE 2 OUTERMOST UNTIED + AND - POSTS which leads to the starter and switch. If the center was tied to frame as its supposed to be and you touched either of the 2 remaining outermost untied posts to frame, it would be a dead and hazardous short circuit.

There then exists two 12 volt circuits, from the outermost remaining untied battery posts to ground, one at pos grnd the other at neg grnd to power 12 volt devices like lights. Since tying those 2 12 volt batteries in series creates 24 volts across the outermost untied terminals, thats the 24 volts used for the starter.

If you need more help post back or e mail jmn50@msn.com and we will go from there.

Good Luck n God Bless ya

John T

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Clooney

12-16-2003 14:05:47

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Re: 730 Diesel battery Wiring in reply to Deere Heaven Austin, Tx, 12-16-2003 12:05:25

Brian, you ask...

~"It has two 12 volt batteries correct me if I am wrong but there should be a cable connecting 1 positive post to 1 neg. with a wire connecting to the frame"...>>> Answ, that is true but it MUST be the connector cable between the two batteries [not the end battery posts].. So it does matter what posts are grounded [see picture]..

~I modified a 730 wire print to show how it wires with 2-12 volt batteries.. If you hook it up like the picture & the lights still dim & you get sparks, you probably have a wire hooked to ground that shouldn't be..

~If it still sparks, post or E-Mail & we will help you locate the short to ground..

JDClooney@aol.com

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Deere Heaven Thanks Cloo

12-16-2003 14:29:51

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Re: Re: 730 Diesel battery Wiring in reply to Clooney , 12-16-2003 14:05:47

Thanks clooney that is a perfect picture. Brian

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Deere Heaven

12-16-2003 13:11:53

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Re: 730 Diesel battery Wiring in reply to Deere Heaven Austin, Tx, 12-16-2003 12:05:25

I Am trying to finish up the electrial system, This is the problem I am running into. I ave a new wiring harness, rebuilt starter, generator,new switch and lights. The problem is I can only get the right side lights on. Back in October I asked the same question and a few guys helped me out, but no luck. I do have a 1960 edition of the IT manual, but I need to know what it looks like with 2 12 VOLT BATTERIES not 4 of a 6 volt. Am thinking its the little ground wire to the case but not sure I do noth have this? Thanks, Brian

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Larry

12-16-2003 13:37:37

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Re: Re: 730 Diesel battery Wiring in reply to Deere Heaven , 12-16-2003 13:11:53

Brian,
It sounds like you are on the right track. My IT manual had diagrams in it but used the 4 6 volt batteries as you say. Just study it a little. The 2 on left will be the same as 1 12 volt. More important, if you do not have a small jumper wire from battery post to seat frame your lights will not work on the one side because that is your ground for the lights. I'm sure Clooney or someone can explain better but on these 24 volt systems it is a floating system and you don't really have a large ground cable like a 12 volt system. That small wire only provides a grounding contact for your lights and gauges. Half your lights are on one circuit and half are on a different one. If you have a new switch etc. you should have noticed the different terminals on the back for the different lights. Sorry, if this is clear as mud now but the diagram in the IT manual does a pretty good job of showing the different circuits and how they connect.

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Hoppy

12-16-2003 13:28:23

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Re: Re: 730 Diesel battery Wiring in reply to Deere Heaven , 12-16-2003 13:11:53

Brian, I drove myself nuts trying to get the lights to work on my 830 until I looked at the schematic and saw a small wire between 2 and 3rd battery to ground.

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Deere Heaven

12-16-2003 13:30:22

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Re: Re: Re: 730 Diesel battery Wiring in reply to Hoppy, 12-16-2003 13:28:23

I saw that wire, but I was not sure if it was needed with 2 12 batteries?

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Larry

12-16-2003 13:40:42

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Re: Re: Re: Re: 730 Diesel battery Wiring in reply to Deere Heaven , 12-16-2003 13:30:22

Brian, I didn't update my posts until after my above message. Yes the small grounding wire IS important on 4- 6's OR 2- 12's. That is the ground for the lights on one side. Hope this helps.

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12-16-2003 16:59:52

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Re: Re: Re: Re: Re: 730 Diesel battery Wiring in reply to Larry, 12-16-2003 13:40:42

That little wire is the common for lights on BOTH sides, not just on one side.

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Deere Heaven Thanks

12-16-2003 13:45:41

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Re: Re: Re: Re: Re: 730 Diesel battery Wiring in reply to Larry, 12-16-2003 13:40:42

I got it, it was that little ground wire was nt gitting a good connection, due to new coat of green life. Thanks for everyones help Brian

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Larry

12-16-2003 13:01:33

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Re: 730 Diesel battery Wiring in reply to Deere Heaven Austin, Tx, 12-16-2003 12:05:25

Yes, it does matter!!! I don't have my wiring diagram with me but I'm sure you can do a search and get the information. I think someone ask this same question last week. If you still have the original system it is a 24 volt starter and generator NOT 12 volt. If my memory is correct the left battery has the pos. going forward to starter. The neg. post is hooked to the pos. post of the right battery. There is also a small grounding wire to the battery box. The neg. post on right battery goes to the starter solenoid. I'm sure someone will correct me if I'm wrong. I always disconnect my 730D batteries in the winter then have to check my wiring diagrams again in Spring to make sure I do it correct.

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old

12-16-2003 12:14:03

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Re: 730 Diesel battery Wiring in reply to Deere Heaven Austin, Tx, 12-16-2003 12:05:25

If I remember right its still a 12 volt starter so you should be hooking them up positive to positive and negative to negative. And if it has an alternator it will be negative ground

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Hoppy

12-16-2003 13:04:14

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Re: Re: 730 Diesel battery Wiring in reply to old, 12-16-2003 12:14:03

Do some serious checking before you hook up everthing. You are dealing with alot of ampereage and can do alot of damage. If your 730 Diesel is stock and not jury rigged it should have 4 6 volt batteries with a positive ground, a 24 volt generator and 24 volt starter. Your cable from the starter should be hooked to the first battery on the negative side, the positive to the neg on bat # 2 the pos on 2 to the neg on 3 and so on until you run a ground from pos on # 4 to ground.
Also you must run a small ground from the jumper between bat 2&3 to the case for lights.
I know this sounds confusing but experience on a 730 &830 El start has taught me. Use clean connections as the amperage is enough to burn a post off on loose connections.

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BE CAREFUL!!!!!!!!!!!!!!

12-16-2003 12:54:56

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Re: Re: 730 Diesel battery Wiring in reply to old, 12-16-2003 12:14:03

If it's an original electric start, it is 24 volts, and you really damage things if you don't have the cables correct.

I don't have a diagram handy, but wait just a bit until someone stops by with the correct schematic!

You could explode a battery if you're not careful!

Frank

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